diff --git a/tests/opt/bug4610.ys b/tests/opt/bug4610.ys
index fc9f0ae434b..0bec5935958 100644
--- a/tests/opt/bug4610.ys
+++ b/tests/opt/bug4610.ys
@@ -1,4 +1,4 @@
-read_ilang <<EOT
+read_rtlil <<EOT
 autoidx 1
 module \top
   wire output 1 \Y